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In contrast to space-partitioning index structures, data-partitioning index structures naturally adapt to the actual data distribution which results in a very good query response behavior. Besides efficient query processing, modern database applications including computer-aided design, medical imaging, or molecular biology require fully-fledged database management systems in order to guarantee industrial-strength. In this paper, we show how we can achieve efficient query processing on data-partitioning index structures within general purpose database systems. We reduce the navigational index traversal cost by using "extended index range scans". If a directory node is "largely" covered by the actual query, the recursive tree traversal for this node can beneficially be replaced by a scan on the leaf level of the index instead of navigating through the directory any longer. On the other hand, for highly selective queries, the index is used as usual. In this paper, we demonstrate the benefits of this idea for spatial collision queries on the relational R-tree. Our experiments with an Oracle9i database system show that our new approach outperforms common index structures and the sequential scan considerably.